When he saw three men get hit, a triumphant grin instantly appeared on Du Xiaoqing's face.
The oil stored inside those two buckets wasn't just ordinary vegetable or animal oil—it was a rare, expensive underground mineral oil that their Twelve Linked Rings had purchased for a hefty sum from the north.
This oil could only be found by chance while mining deep underground in the north.
The oil was black, thick, pungent, and extremely sticky; if spilled on the ground, it was nearly impossible to clean without prolonged scrubbing, and it was highly flammable. Once ignited, it would instantly reach an extreme temperature, and even masters of Inner Strength couldn't put it out quickly with their power.
It was truly a trump-card weapon for defending a city.
Exactly because he had this ace up his sleeve, Du Xiaoqing wasn't overly panicked when he saw more than ten Inner Strength experts scaling the city wall.
